Power bank



FIG. 1 is a front elevational view of a power bank showing our newdesign;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a first perspective view thereof;

FIG. 8 is a second perspective view thereof;

FIG. 9 is a third perspective view thereof; and,

FIG. 10 is a fourth perspective view thereof.

The broken lines present in the figures are included for the purpose ofillustrating portions of the article which form no part of the claimeddesign.

CLAIM The ornamental design for a power bank, as shown and described.